1002
Number 1002 is an Alco RSD-1.  It was built in 1943 (builder #70653) for the U.S. Army, #8038.  The Alaska Railroad purchased it in 1949 and rebuilt it in 1950.  It was later converted to ARR RF1B 1055 in 1950

 
Alaska Railroad Photo, courtesy of the Jack Klingbeil Collection